# if 5>12:
#     print("5 is greater than 12")
#     print("222222")
# else:
#     print("5 is not greater than 12")


# age=30
# if age<18:
#     print("You are underaged")
# elif age >=18 and age<30:
#     print("You are Young")
# elif age >=30 and age<50:
#     print("You are middle-aged")
# else:
#     print("You are Old")



# year=int(input("请输入年份："))
# if (year%4==0 and year%100!=0) or (year%400==0):
#     print("%d是闰年" % year)
# else:
#     print("%d不是闰年" % year)



# a = int(input("请输入a: "))
# b = int(input("请输入b: "))
# c = int(input("请输入c: "))
# if a>b :
#
#     if a>c:
#         print("a is the largest number")
#     else:
#         print("c is the largest number")
#
# else:
#     if b>c:
#         print("b is the largest number")
#     else:
#         print("c is the largest number")



# num1 = float(input("请输入一个数字："))
# num2 = float(input("请输入二个数字："))
# op = input("请输入运算符： ")
# if op=="+":
#     print(num1+num2)
# elif op=="-":
#     print(num1-num2)
# elif op=="*":
#      print(num1*num2)
# elif op=="/":
#    print(num1/num2)
# else:
#     print("输入错误")






